Using two pairs of copper wires to provide T1 transport delivery, HDSL4 maintains spectral
compatibility beyond the carrier service area (CSA) range as well as on repeatered loop applications.
Service providers can realize numerous benefits by deploying this latest advancement in symmetric
DSL services. For instance, the technology offers extended reach and spectral compatibility with
ADSL. In order to make optimal DSL technology deployment choices, though, service providers need
to carefully analyze the application before selecting technologies and the associated equipment....